Rotary engine.



No. 655,2ol. I Patented Aug. 7, |900.

L. A. PER.

ROTAR NGINE.

5 Sheets-Sheet 2 No.` 655,2ol Patented Aug. 7, |900.

L. A. cooPER.

ROTARY ENGINE.

(Applicatiun mea occ. 27, Isae.) (lo Model.) ,5 Sheets-Sheet 3.

Illy. 6.'

No. 655,2m. Patented Aug. 7,1900.

L. A. CDDP-ER. noTAnY ENGINE..

- (Application led Oct. 27, 1899.) (N0 MNM.) 5 Sheets-Sheet 4.

Patented Aug. 7, leon.'-

.Fm R Em. PG

N ME CY .R AA

(Application led Oct. 27, 188%) (lo Modal.) l Y 5 Sheets-Sheet 5.

-Uivirnn STATES 'PATENT FFIC;

LnS'Li A. coorER, orSPRiNeFiELD, MASSACHUSETTS, ASsieNoa or oun- THIRDTO ALVAH H. SABIN, OF NEW YORK, N. Y.

Ro'rARY ENGN;

SPECIFICATION forming part or Letters raf-.ent No. 655,201, dats August7, 1906.

Application tiled October 27, 1899. Serial No. 734,902. (No model.) Y

va resident ofA Springfield, inthe county o'f ampden and State ofMassachusetts, have invented certain new and useful Improvements inRotary Engines, of which" the following is a full, clear, and exactdescription.

This invention relates to improvements in rotary engines and rotarycompressors for air or other elastic fluids and principally, althoughnot in all respects, to compound concentric-piston rotary engines.

The main object of the invention is to devise an engine of the classmentioned which will be composed of a minimum number of simple andcomparatively-cheap and easilyconstructed parts, that will be verydurable and capable of being run a long time with the avoidance of anyconsiderable or detrimental Wear or deterioration, and whichabove allwill serve to utilize the steam economically and at the same timeacquire a very high efficiency.

Another object of the invention is to so construct the engine,especially as regards the rotary pistons and abutinents thereof, as toavoid all disadvantageous effects `of expansion of the rotary pistonsand abutments longitudinally, whereby these parts-might bind or becomecramped in the engine-case.

Another object of the invention is to provide means to reinforce theintermediate portion ofthe shaft or arbor on which the rotary abutmentsare carried, so that the tendency of the steam employed within theengine to deflect the abutment-shaft at its middle portion may notresult in a hard running of the engine and in undue wearing of therunning parts. t

The invention consists in a steam-engine having the parts composing itor employed-in conjunction therewith constructed and combined orarranged substantially as hereinafter described, and setforth in theclaims.

'Reference is to be had to the accompanying drawings, Vin which myinvention is exempliiied in the forin of a"4 novel triple-expansionengine, and in whichM Figure 1 is substantially a central longitudinalsectional View through the engine case and bearings for the rotarypiston-shaft and the shaft of the Vrotary abutineiits, the said shaftsand the parts carried thereby being seen in side elevation. Fig. 2 is avertical cross-sectional view asV taken on the line 2 2,

Fig. 1, looking in the direction of the arrow. Fig. 3 is a verticalcross-sectional view of the engine as taken on the line 3 3, Fig. 1,which intersects one of the rotary and one of the non-rotatingpartitions separating 'the rst steam-chamber from the next. Fig.A 4 is aview somewhat similar to Fig. 3, bu't taken' on the line 4 4, Fig. 1.Fig. 5 is a longitudinal vertical section of the engine-case minus theend, heads and with all the internal parts removed, as taken on theplane indicated by the line wx, viewed-in the direction of the arrow 5.Fig. 6 is a sectional view similar' to Fig. 5, but comprising only theupper portion of the engine-case, as seen in vertical section on thesame line ai w, Fig. 2, but viewed in' the direction of the arrow 6.Fig. 7 is a hori-y zontal sectional view of thel upper portion of l theengine-case, as taken on the line 7 7, Fig.' `2, and looking upwardly.Fig. 8 is an end elevation of the engine. Fig. 9 is a plan view of thesame, a portion thereof, comprising the oil-separator, being shown inhorizontal longitudinal section.y Fig. 10 is a perspective view designedto facilitate the description hereinafter given of the peculiarconstruction of the parts designed with reference to assuring the 1course of the steam successively into and away from the threesteam-chambers of the engine. Fig. `11 is a side view of the rotaryappliance i comprised in the oil-separating apparatus.

or chambered body of the engine, having at lthe lower portion'thecylindrical space ci, eX-

tending from end to end, and at the upper portion the cylindrical spacea2, also longitudinallyextendingand open along its length to the spacea.'

The motor-body is cast with a suitable base IOO ' of vwhich are formedrecessed or cutaway, as

seen at l in Fig. 8, each on an arc of a circle, and these recessedportions 10, together with. the internal end portions of the walls ofthe space a2, are screw-threaded for the reception of the heads a, whichclose the space d within the upper portion of the motor-cas- Theend-closing heads 0.3 and d4 are constructed with concentricoutwardly-extending hubs and are formed with concentric openings forbearings for the journal-shafts B.

and C of the rotary pistons and the rotary abutments. n

As shown, the rotary shaft B has at its opposite ends .the circularflanges and 13, which it peripherally closely and yet for free rotarymovements therein the internal wall of thecylinder-space a, and betweenthe said flanges or disks are the ianges ordisks 11.

and 12 to similarly fit the space ct in the casing. The said flanges 10,11, 12, and 13in vpart form ,partitions transversely dividing the Spacewithin the motor-body into several` chambers P, S, and T, the completionof the dividing-partitions being constituted by the blocks or castingsb1", i911, Z912, and i213, all having the form of a major crescentandtted in the upper cylinder-space a2, each with its rentrantarc-shaped edge 15 in contact on and conforming to the periphery ofthe'lange,

' of which itis an edgewise continuation, the

ary partition-sections, are iixed the rotary abutments, astermed in thisclass of engine, the same being respectively indicated by thereference-letters p2, s2, and t2, each of which is in the form of acylinder having a size to -t the space a? in the engine-body and each lhaving the recess 19 at its edge, so that the 55. j tate once to everyrotation of the'rotary pisrotary abutments, which are geared at tj, ro-

tons will have recesses 19 in positions to leave unobstructed thepassage of the piston-blades when the latter come around adjacent therotary abutments. i

c indicates the steam -inlet port, which leads through an upper portionof the enginebody near its end portion, Within which is the.

primary steam-chamberP between the rotary partitions 10 and l1, and, ashere shown, the poiutof entrance of the inlet-port is about atthejnnction of the one side of the main cylinder-space a with thesupplemental space a2 for the rotary abutments, and at about the sameheight as inlet-port c, but at the opposite side of the engine-case, isa passage d, the same having a spiral course or one which is in' partcircumferential around within the internal wall inclosing said space a2and which also has a longitudinal trend, so that while the one end 21'thereof leads from the chamber lP its opposite end 22 terminates withinthe space 0,2 on the inner wall of the casing that is covered by thestationary partition b11,which is cored out, as shown in Figs. 1, 3, and10, to constitute the passage 23 for the steam exhausted from theprimary cylinder-chamber P.

` The passage 2 in the stationary abutment blhopposite where it'registers or communicates with the exhaust-portz22 of the primarysteam-chamber P, registers or communicates with the port or terminal 24of the passage e', which also is formed within the thickness of thewall-of the casting composing the enginebody, the same having a spiralcoursethat is, it extendsaround to have its opposite end enter thesecondary steam-chamber S, la longitudinal trend being given thereto.AvY

l The steam in the chamber S afterimpingement against the piston-Wing stherein to drive the same around and after the same` has made -thegreater part of a revolution leaves the l steam free to be exhaustedfrom said chamber 1 S through the exhaust-port at the terminal of thepassage d2, opening to which is the passage 25, formed within thestationary partition b12 above and edgewise against the rotary partition12., said passage 25 at the opposite side of the case communicating withthe duct or channel f, which because of its curved and also longitudinalyprogression opens into the lthird'steam-chamber T at the same side ofthe engine-body at which the steam had been admitted into the primary-and secondary steam-chambers, and properly oppositel-y-arranged is theexhaust-port g, through which `is discharged the steam which has beenused expansively the third time inthe chamber T. It` will be noted thatthe engine-casing in the plane ofvand above the stationary partitionb12,which has the passageZl therethrough, l as aforesaid, also has theductl or channel 26, of approximately-semieircular form as toits length,`which as Well also as the said passage 25 leads to communication withthe aforesaid rpassage f, thelongitudinal trend of which IOO IIO

carries it oset from theplane of the rotary i and stationary partitions12 and b1? to open into the tertiary steam-chamber T. This constructionaugments tne transferring-passage from the` secondary to the laststeam-chamber to accord with the volume of the steam which hasexpanded'in the secondary chamber to much greater volume than it hadacquired when it enteredl such chamber, i

Viewing Fig. 10 and regardingV the arrows 0*, 6*, and f* ascorresponding to and having approximately the relative positionsl of theducts or passages c, e, and f within the internal wall of theengine-case at one side thereof and the arrows (1*, dtl, and g* ascorresponding to and having approximately the relative arrangement ofthe conduit ducts or passages d, d2, and g at the other side of theupper-portion of the engine-casing, the manner of the successiveactionof the steam against the several rotary pistons in this compoundtriple-expansion rotary engine will be more easily understood.

Asthe engine has been designed and constructed by me the spacecircumferentially within the engine-case. around in which the pistonsrotate comprises between the entrance-passages for the steam into thesteamchambers P, S, and T and the passages c, e, and g, oppositethereto, through which 4the steam is carried out of such chambers,somewhat less than a quarter of the internal circumference of the wallinclosing the space a, and hence the piston s, in the secondarysteamchamber S, is set about a quarter ahead of the piston p in the rstchamber P, so that about as piston p shall have fairly passedexhausting-port CZ forits steam-chamber, whereby the steam from suchchamberis tranferred into the secondary chamber S, the said piston swill have fairly passed the inlet-opening for the secondaysteam-chamber, and so again the piston t is set so far in advance of thesecond piston s that just about as that piston is passing theexhaust-port ofthe secondary chamber, whereby the'steam is dischargedinto the last steam-chamber, the said 4 piston twill have fairly passedthe steam-entrance port leading into the said steam-chamber T, each ofthe succeeding pistonsreceiving the impetus of the steam which has beenexhausted from the preceding steam-cham ber, but the force of which has'not been dissipated.

. The end heads a3 and a4 of the engine-casing, provided with theaxially outwardly extended hubs 3l, are constructed withcomparatively-deep circular openings 30 therein, having the annularshoulders 32, extending centrally through which openings are theextremities of the piston .and rotary abutmentshafts B and C.

33 represents an annular ball-cup 'fitted against the seat at the innerend of the said circular opening 30, adjacentV which is the doublecone-ended sleeve 34, and between the one beveled or conical end and theadjacent ball-cup are the hardened balls 35. The said sleeve is loose onits shaft and comprised between the outer beveled or conical end of saidsleeve and a second ball-cupf33, suitably adjacent, is a second seriesof hardened balls 35, the location of the latter being somewhat withinthe outer end of the opening, which latter is internally screw-threadedfor the reception therein ofthe externally-threaded annular plug 36,having al1 internal inner end annular shoulder and which part 36 is alsointernally threaded for the reception of the supplemental ring-plug 37,which is loose about the shaft and together with the part 36 constitutesthe stuffing-box for the shaft.

38 represents a lock-nut which screws upon the exterior of the said part36, which is extended endwise beyond the hub 3l of the casing-head as ora4, as the case may be, and serves to lock the bearings after the samehave been adj usted by crowding the said threaded part 36 to place thecups, balls, and end cones of the sleeve in properly-close relations.

vIt will be perceived that the end rotary partitions 10 and 13 of thepiston-shaft and also the end stationary partitions 61 and blare Y,

arranged vslightly distant from the end heads of the engine-case andthatall of the stationary partitions, both at the 4ends of and betweenthe rotary abutments, may have endwise compensating movements as may beimparted thereto by the expansion or contraction axially of the partsmounted on the piston-shaft and the parts mounted on the rotaryabutment-shaft, and that any endwise extension or contraction of thepiston or rotary abutment shafts will be without eectfto i tween theparts in peripheral contact or prox-` ICO imity than there is betweenthe pistons and cylinders of any engine, and binding of the partsperipherally is overcome in this engine in part by the fact that weightof the running IIO parts is entirely supported within the journals atthe end heads and because, furthermore, I'have made provision wherebysuch impact of the steam as may come transversely relatively to therotary abutments and which through them may be transmitted to the rotaryabutment-shafts is resisted. The provision to this end consists inproviding one of the stationary partitions (the one, Z912, which is asnear the middle of the engine as practicable) interiorly with a recess40, in which is received the saddle 42, having the rollers 43 43 journaled therein and which are peripherally in contact with the saidshaft C, which passes loosely through the said partition 1112, and athreaded plug 44, which screws through the top of the motor-casing andhas its lower portion passed loosely through an opening therefor in theupper wall of the -cored-out stationary partition and bears by its lowerend against the top of the saddle. This reinforces the rotary abutmentat its central` portion, where there would be the greatest the brushnearl its' core. `The mist-likepar#V tageou'slyY supported 'in and'extended'v upv WardlyA above the baseVV of the drain-channel 59 into thechamber G and' lappingbythe-' it toiresiltin carrying the adjacent facesof theabutrnent and rotary partitions outof co'- inciding planes andotherwise' the shaft ont of alinelnen't. The steam is finally exhaustederably forinedAV inhalf-sectio'ns; with angurThese ring-plateA sec'tions are'su'p'ported Vby arms 56',- carried by.

larly-t'urn'ed lips' 55.

sectional hubs 57, which areclamped'y about the/core 52' by therscrejws,bolts',x or rivets'Y 58'.y

vAlolngi; the base of the casingriniwhich' is" the chamber G5, is thechannel `59,A the saine downwardly opening-at one end thereof totheoil-receiver? H, Whilefatthe" end ofthe casing' G' opposite that atwhichthe 'steamy iseir-Y hausted' thereiutoisf the final steamdisclrargeconduit 60: A z

. Thefshaft'O'is driven by theexternally'-A Yapplied gearing624 63,shown' aslrun frornf the rotary-abutment shaft-gear jf. v n

' The admixe'd fstearn and'olll er1-term g the 'initial end of thecasin'giG'is causedf by the-ring# plateto necessarilymainly'passalong'through:

ticles of oil arearrested by and collected oni thewires` and by thecentrifugal action there-'- of thrown outwardly against the surroundinglwallV of the chamber G and rundowntothe Vbottonrthereof intothe channel59 and thence into the receiverH-.- Asthesteam-Will hav-ef a* tendencyto'worktoward the Wall of the chambe'lgthe -succ'ess'ionof thering-platesfareprovided at 'suitable intervals, as 'before-nnen-Vtionedp to constitu-tea steam-breakv,"v so thatit'willhaveitscoursediverted severaltimesl toward the core' of the brushtogiv'eall por-A tions* of the llatter opportunity to exert its"oil'cellecting action before'the steam-passingI through the chamber G'reaches the Yfinal: dis-` charge-passage 60.y Y

' In addition tothe rotary wires or-collectin'g'- menibers.` I may alsoemploynon '-ro tary wires or collecting members, whichv may be' advan`endsfof the revolublewires,vacant' places being left in thebrushelikeappliancetoaccom# modate these stationary Wiresor proj ections".`Thefpurpo'se of these stationary Wiresor pro" jections will be explainedas follows:` The' steam* after having entered Within the brush'-lwireswill after awhile have developed a rev` oluble motion more or lessnearly in consonance' therewith; whereby the 'beating action by thebrush-Wires on the' steil-mand the4 oil 'elements-therein becomeslessened. L t

Theprovisionof the" stationary wires or members projecting from thewauof metas@ Well'tow'ard the core of the' brush constitute l not onlyadditional parts against which the ,steam will impinge and' upon whichdeposit 1 counteract and lessen trhe'rev'oluble and een'l trif u galmotion ofthe steam,` whereby the lati ter in its continuedgcoir'se'through' the brush wireswil1l' be bythe latter rn'oe ecientiy Vwh'ippedand will consequently insure that the said -brusl'1'wi`res'wi'll'collect thereon a greater proportion of thefoi'l which .i'sheld jin'suspension by the ste'axn passing there= {throughz has been`constructed"- with reference to its capability for utilizati'on'asan.ai'rcornpressing'V `iengineo'r compressor for other compressi'blefluids o'r-g'ases; attention is thereforev directed ving itssubstantallyspiral couse through the engine in'- the reverse? direction1froid-that described for the steamwill by there'voluble .fpi'stonslwhich by their rotations in' a ld'irecf- Y tionopposireithanimpartedftneretaby nheexpandin'gsteam',l cofnipress theair 'rstjin thelarge chamber T, again to a furtherlesseued volume inf chamber' S," and'af' third time to' a i still decreasedi vol'u' e' inthe chv benl); the`jso'com'pressed' air passing'- froin-tl'il flfl stconn'-Vpression-chamberthrough theport c -.j p Having-thus described niyinventionwhat VI cla'ifnr,y andidesi're to secure'l by Letters Patglent,ist-L" v "1.Ip`n a"rotary'concentriclpistoi compoundsteamen'gine,thechambeed'engine-caseghavving therein a shaft providedwith several sep' l: aratedy rotary partition-flanges;and therebetwee-npiston-wings extending I roni- ,the one Bange to'l theothler;- and-afsecond shaft `lifaviu gY ltherotary abutments, the lenigths'ofwhichl correspond to the spaces between the-rotary fpartitionliia-nges;and uon-rtar'yiparti ions between y the rotary abutmentsgf complemeni?peripherally fitting the internali wafll of the single enginei'casegasteain#inlet4 passage'lead-l ng into the steam`-chamber comprised befftween the Iirst twoV rotary partitions,-faf4 dis herefroniandenter'ingaA succeeding' steainjcharnber`withinthe-said casing and'anyon-` "haust-passageifor-suchlatter' stearn`cha`1nber. 2j. -I'n a`rotary concentric-piston lcompound Q steainlen gine, the chamberedengine-case ha'ving therein a'shaftprovided-Wift'h several-sep# garated'rotary partition`"ianges3V and therebe# flange to theother, anda' second'V shaft hav# m'ore or less 'of the contained oi'li` but will.tary to andl arranged edgewise'VV adjacent-'the {'rotary partitions4`all said rotary' partitions' androt'ary abutmentsbeingcon-tainedfinandchargiugpassage for that' chamber leading' {'ltiieen piston-Wingsextending frein 'tli'e' one ling the rotary abutments5thelengths ofwhich inasmuch afstifel engin-entrent descritta to the fact thatla'ir"introduced into and havcorrespond to the spaces between the rotarypartition-anges, and non-rotary partitions between the rotary abutments,unattached to the engine-casing and free for compensating movementslongitudinally of the engine, and arranged edgewise adjacent the rotarypartitions,all saidrotary partitions and rotary abutments beingcontained in and peripherally fitting the internal wall of the singleenginecase, a steam-inlet passage leading into the steam-chambercomprised between the first two rotary partitions, a discharging-passagefor that chamber leading therefrom and entering a succeedingsteam-chamber withinV outer faces of said flanges adjacent theinner.

sides of the end heads being separated therefrom and the other` shafthaving a rotary abut-` ment running between two of the rotary par-1tition-flanges, a piston-wing extending between the rotary partitionsand constituting a movable Wall of thev steam-chamber comprised betweensuch' flanges, a' steam-inlet passage and a steam-outlet passage leadingposes lset forth. y 4c. In a concentric-piston rotary steam-engine, anengine body or casing comprising the partially-cylindrical space a andthe adjoining partially-cylindrical space a2, the one being openrtotheotherand having opposite end heads with journals, parallellongitudinally-ranging shafts B and C, journaled in said end heads, andcapable of axial compensating movements therein, the one shaft havingseparated Arotary partition-flanges peripherally fittin' g the internalwall of said spacei a, the outer faces of said flanges adjacent theinner sides of the end heads, being separated therefrom, and the othershaft having a rotary abutment running between two of the rotarypartitions,l the unattached non-rotary partitions of crescent shapeedgewise fitting the peripheries of the rotary partition-flan ges, apiston-wing extending between the rotary partitions and constituting amovable wall of the steam-chamber comprised between such flanges, asteam-inlet passage and a steamoutlet passage leading to and from thesteamchamber, for the purposes set forth.

5. In a concentric-piston rotary compound steam-engine, lanengine-casing having the spaces a and o? extending from end to end, andhaving a series of steam-inlet ports'arran ged along one internalportion of said casto and from the steam-chamber, for the pur- Ving andsteam-outlet ports arranged along a suitably-distant internal portion ofthe casing, parallel shafts, one carrying piston-win gs and the otherabutments, partitions between cooperating pairs of the pistonandabutments, which separate the steam-chambers, into and from each ofwhich one of the inlet and outlet ports communicate, and unvalvedoreveropen and unobstructed passages leading from the outlet-port of aprimary steam-chamber into the inlet-port of a secondary steam-chainber,for the purpose set forth.

6. In a concentric-piston rotary compound steam-engine, an enginecasinghaving the spaces ct and a2 extending from end to end, and having aseries of steam-inlet ports arranged along one internal portion of saidcas- ,ing and steam-outlet ports arranged along a 'suitably-distantinternal portion of the casing, parallel shafts, one carryingpiston-wings and the other abutments, partitions between cooperatingpairs of the pistons and abutments which separate the 'steam-chambers,into and from each of which one of the said inlet'and one of the saidoutlet ports'commu- `nicate, and unvalved or ever open and un-`obstructed passages leading from the outletport of a primarysteam-chamber into the inlet-port of a secondary steam-chamber, the

piston-wings revolving in a secondary chamber being set in advance ofthe piston-wing in the steam-chamber primary thereto,for the purpose setforth. i, 7 In a compound rotary concentric-piston engine, an enginecase or body constructed for and receiving the piston-shaft B havingseveral separated rotary partition-anges with partition-wings extendingfrom the one iian'g'e to another, and the rotary abutmentshaft C havingrotary'abutments lapping by, and entering the spaces between the rotarypartition-flanges wherein are comprised the steam-chambers, an inlet forthe first steamchamber leading Athereinto, an outlet ,port leading fromsaid steam-chamber and continued in a substantially-spiraldirection andterminating in a suitably-opposite port entering the next succeedingsteam-chamber.

8; In a compound rotary concentric-piston engine, the engine-case havingjournal-supported-thereby the piston-shaft B and a rotary abutment-shaft0,the first having aplurality of piston-wings and the secondrespectively cooperating rotary abutments, partitions dividing thespaces in which the piston-wings revolve one from another constitutin gtogether with the engine-case separate steam-chambers, means forintroducing and exhausting the steam into and from the several chamberssuccessively, and adjustable means for reinforcing the middle portion ofthe abutment-carrying shaft against being deflected by thesteam-pressure transverse thereto. i

i f 9. A compound rotary concentric-piston engine, comprising the'engine -case and the j ou mal-supported piston-shaft B with rotary IOOIIO

IZO

piston-Wings and the rotary abutment-shaft' 10. In a compoundrotary-engine, compris-A l ing shafts having .several piston-Wings,V andcoperatin'g .rotary abutments, partitioning means between the 'pistons'and abutments,

whereby the separate steam-chambers are comprised Within the engine-casethat is in p common to, and incloses allv the rotary pistons andcorresponding rotary abutments,a steampassage leading into theprimary'steam-chamber, and passages continued from each steamcha'mber,to each succeeding steam-chamber whereby the 'steam is caused to pursuea practically-helical course through the engine for successive expandingactions against the piston-Wings in the respective chambers therefui. p

' 1 1. In a rotary engine, the end heads thereof havingcentrally-apertured hubs through which' the shaft of the engine extendswhich is provided with the closely-fitting butunattached sleevecone-formedat both its ends,A the series of balls provided to supportthe inner conical end of the sleeve, a second. series of balls andarball-cup outside thereof provided' in the hub-opening on Which'ballsthe outer conical end of the sleeve is supported, the'annular screw-plug36 threading into the Voute endpo'rtion of said apertured hub againstsaid ball-cup, and serving to adjust the same and a locking-nut on theouterl end thereof, all whereby endwise expansion of the shaft may beWithout effect to change the adjusted conditions of the saidball-bearing.

12: An engine-case, having spaces each of the form of a portion of acylinder and the one along its length open to the other,longitudinall'yranging parallel shafts, piston- Wings on one shaft androtaryrecessed abutments on the othershaft, stationary partitionsectionsbetween the rotary abutments, and in the'planes thereof vdisksconcentric with the piston-shaft which divide the chambered engine-caseinto separate steam-chambers, an

inlet -bpening entering the primary steamohainber, and an outlet-passageleading from each steam-chamber into the chamber secondn ary thereto.

13. In a compound concentric-piston rotary engine, the combination withthe engine-casing Aconstructed lWith the longitudinally-extendinfr saces .a and a2 each com rising aportion of the cylinder and opening theone to the other, the rotary piston-shaft having the rotary partitions10, 11, and 12, whereby separated primary and secondary steamchambersare constituted Within said casing,

'the non-rotary partitions 510,511, and'bwarranged in the planes of andadjoin'ings'aid rotary partitions, the one b having the passage 23therethrough which opens 'to the opposite edges thereof which are fin"contact against opposite sides of the wall of "said space a2, the portleading through the enginecasing at 011e side into the primary chamber,a port formed Within the internal Wall of the casing at the oppositeside of the primary vsteam-chamber, and continued around'and alsoendwise to connect with the`ne end of the other, and provided with thesteam-inlet j portc and other ports'fe and f which are continue'd inpassages having a course around and also endwise along Within 'theinner-Wall of the said space 0,2,the rotary piston-shafthavin g therotary partitions 10, 11, l2, and'13, fitted Within the saidfspace 1 andthe non-rotary crescent-shaped partitions bwand 1913, and the non-rotarypartitions bu'and E12 Which'have the' passages 23 and f 25 Ytherein"vv-hichopenat the opposite-edges thereof, said Vpassages each atits one end `matching with'thepassages continued from said ports and j,-the piston-Wings p, s, andt, and thecorresponding rotary abutments p2,s2, and t2, andmeans for rotating them and said casing furthermorehaving the ports 'd and d openinga't the inner portion of the Vchamber acovered bythe said non-rotary partitions h1? and Z212, and'havingcommunication With'the passages therein and having endwise courses andterminating in the second and third steam-chambers, and

an exhaust-passage for the third steam-chamber, substantially asdescribed. 'f f 15. In a rotary engine, an engine body or casing havingpartially cylindrical'spaces therein, Aopening the one co-the other, andextending to the end 'of the casing, and an end closure for 'theenginefcasin'g comprising a head of-circular form fitted at the endfofthe IOO one partially-cylindrical space, andhaving a curved recess inVits edge, and acylindrical head fitted at the end portion of the othercylindrical space and also vmatching' Vin the curved recess of therst-named head.`

16. In a rotary engine, the engine bodyV or casing having thepartially-cylindrical spaces therein opening the one to the other, andextending to the end of the casing, and an end closure for theengine-casing comprising a head of circular form screW-threadingn theend ofthe 'onc p'artially-cylindrical space and having a curved threadedrecess in its edge,

the corresponding headan annular packing may be interposed. Io

Signed by me at Springfield, Massachusetts, this 23d day of October,1899.

LESLIE A. COOPER.

Witnesses:

WM. S. BELLoWs, M. A. CAMPBELL.

